linux-kernel - Re: linux-next build error (3)

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Date:   Tue, 24 Jul 2018 13:55:24 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     syzbot <syzbot+9118f0a7ae77f4eee4a9@...kaller.appspotmail.com>,
        Harry Wentland <harry.wentland@....com>,
        alexander.deucher@....com, Matthias Kaehlcke <mka@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: linux-next build error (3)

On Tue, Jul 24, 2018 at 1:44 PM, Tetsuo Handa
<penguin-kernel@...ove.sakura.ne.jp> wrote:
> Dmitry,
>
> Can you temporarily disable config options which are causing this build error?
> syzbot is failing to test next-20180723 and next-20180724 due to this problem.

Do you know what are these configs?


> By the way, ".config" at
> https://syzkaller.appspot.com/bug?id=bd788040e839b85be53a030f219a2a1e4dc8acd2 is
> failing because of empty link.
>
>   <a href="">.config</a>

I will take a look.

> On 2018/07/23 20:39, Dmitry Vyukov wrote:
>> On Mon, Jul 23, 2018 at 1:38 PM, syzbot
>> <syzbot+9118f0a7ae77f4eee4a9@...kaller.appspotmail.com> wrote:
>>> Hello,
>>>
>>> syzbot found the following crash on:
>>>
>>> HEAD commit:    6d93abaf4c5b Add linux-next specific files for 20180723
>>> git tree:       linux-next
>>> console output: https://syzkaller.appspot.com/x/log.txt?x=10e02f0c400000
>>> dashboard link: https://syzkaller.appspot.com/bug?extid=9118f0a7ae77f4eee4a9
>>> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
>>>
>>> Unfortunately, I don't have any reproducer for this crash yet.
>>>
>>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>>> Reported-by: syzbot+9118f0a7ae77f4eee4a9@...kaller.appspotmail.com
>>
>> +Matthias,
>>
>> I guess this is caused by one of the following commits, and probably
>> affects KASAN and similar tools:
>>
>> commit cc32ad8f559c36ca2433d282aff690a6842a3a27
>> Date:   Thu Feb 8 12:53:16 2018 -0800
>>
>>     amdgpu/dc/calcs: Support clang option for stack alignment
>>
>> commit 37172013fa2e527735ec9eda51a11cfea3af0ff1
>> Date:   Thu Feb 8 12:53:14 2018 -0800
>>
>>     amdgpu/dc/calcs: Consolidate redundant CFLAGS
>>